3.8 Proceedings Paper

Optimisation of the performance of holographic beam-shaping diffractive diffusers through refinement of the recording process

Journal

Publisher

SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2555774

Keywords

Holography; Volume gratings; Diffusers; Photopolymer; Diffractive optics; Holographic optical elements

Funding

  1. Enterprise Ireland [IP20190855]
  2. EU European Regional Development Fund (ERDF) 2014-2020 Programme

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Optical diffusers have uses in laser applications and machine vision. Typical fabrication at a commercial level requires master production and the stamping/copying of individual elements at scale. This expensive, indirect process inhibits custom diffusers at reasonable cost. Previously the authors published a novel, direct, single beam method of recording customizable and controllable volume holographic diffusers by manipulating laser speckle and recording the pattern in photopolymer. This method allows for beam-shaping to produce diffusion patterns of various sizes and shapes. In this work, the direct method of recording controllable holographic diffusers is refined to improve diffuser performance (i.e., a decrease in zero order strength) for a simple diffuser. This is achieved through optimising the recording conditions (exposure energy, power and layer thickness) for a given photopolymer formulation. Significant improvement in the diffuser efficiency is observed through the optimisation process for a particular speckle size, resulting in a five-fold decrease in the remaining zero order. Kogelnik Coupled Wave Theory (KCWT) is explored as a first step towards developing an appropriate model for the behaviour of holographic elements recorded with interference patterns formed through stochastic processes, such as speckle patterns.

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